Remove Trojan:Win64/Sirefef.D – Trojan Horse Removal Guide

By | April 1, 2015

Trojan:Win64/Sirefef.D has infecting your computer and made it almost unusable? Wonder why your antivirus program cannot block this Trojan horse from infecting your system? Have difficulty in removing this threat from your computer completely? Are you looking for an effective method to remove Trojan:Win64/Sirefef.D without causing any side-effect to your system? If so, you can read through this post.

What Is Trojan:Win64/Sirefef.D?

Trojan:Win64/Sirefef.D is a dangerous Trojan horse that that infects your PC and steals your personal information & data without any knowledge and permission. When infected by Trojan horse, your computer will suffer from a drastic slowdown in performance and network speed. This is because that this Trojan horse will occupy the memory space, disk space & Internet bandwidth. This Trojan horse even can crash your hard disks and also disable different functions and programs. You will also notice an increasing amount of popup ads on your computer screen and the web pages that you are browsing. This Trojan horse will download ad-supported programs which keep popping up various ads and false security alerts, in order to mislead you into paying money for some fake products or non-existent services. Besides, the setting of your browser may be changed automatically. Default homepage and search engine are replaced by unknown ones and your search results are always redirected to some unwanted websites. This happens, just because that the Trojan horse can introduce other types of malware like redirect virus to your computer and cause the annoying browser redirection. If Trojan:Win64/Sirefef.D is not detected and removed timely, it will bring very disastrous and dangerous effects, such as complete system failure, registry corruption and even identity theft. Therefore, immediate removal of the Trojan horse is very important.

You may find it is hard to remove the Trojan horse completely, even though you have had a reliable antivirus program installed on your PC. Actually, most stubborn Trojan horses are designed with rootkit technique which allows them to intercept and substitute system functions, in order to make the infected file invisible to the operating system and antivirus programs. Sometimes even the registry branches – where the Trojan horse are registered – and other system files are hidden. Trojan:Win64/Sirefef.D is one of the Trojan horses that use this rootkit technique. To evade from detection and removal, it will even actively search for any antivirus programs in the list of active applications on your computer and try to block them from running normally. Also, it will attempt to damage the antivirus databases and prevent the correct operation of the antivirus software’s update processes. Hence, it is important that you get rid of this Trojan horse without any delay. You can follow the guide given below to accomplish the removal immediately.

Note: If don’t have much computer expertise, you should not attempt the manual removal method. Anything done wrong during the removal process could lead to serious system damage. For the sake of safety, it is highly recommended that you download and install a professional malware removal tool to remove the nasty Trojan horse automatically. Click and download SpyHunter right now!


Why Is It Hard to Remove the Threat Using Antivirus?

You may find it hard to detect and remove Trojan:Win64/Sirefef.D using your antivirus program. Why? First of all, you have to know that an antivirus program or anti-malware program can help protect your computer from malware just because that it is able to recognize that they’re actually malware. However, in these days more and more malware are created by cyber hackers for various purposes and not every type of malware can be easily recognized by an anti-malware program, especially one that hasn’t been updated for a long time. In addition, some cyber hackers know much about how anti-malware programs work and they can write a Trojan horse which has the ability to bypass most security tools.

Trojan:Win64/Sirefef.D is such a Trojan horse that can evade detection and removal by a general anti-malware program. When downloaded onto a computer, it will quickly load itself into the Windows registry, which allows it to be executed every time the computer starts up. Also, it will disguise itself as a part of the system file, attempting to evade detection by the antivirus program. Moreover, this Trojan horse will try to kill process of the antivirus program so as to disable it. All these can explain why it becomes a so difficult task to remove the Trojan horse from an infected computer.

Guide to Remove Trojan:Win64/Sirefef.D from Your PC

Method 1: Manually Remove the Trojan Horse by Following the Guide.

Method 2: Automatically Remove the Trojan Horse by Using SpyHunter.

Method 1: Manually Remove the Trojan Horse by Following the Guide.

Step 1: Terminate process of Trojan:Win64/Sirefef.D.
a. Start the Task Manager by pressing the key combination “CTRL + Shift + ESC”.
b. Under the “Processes” tab, find out and terminate the Trojan horse related process (process of the Trojan horse may be named with random characters and it occupies extremely high CPU usage).

End process

Step 2: Remove all Trojan horse related programs.
a. Click the Start menu, and select “Control Panel”.
b. In the “Control Panel” window, click on “Uninstall a program”.

uninstall a_program_1

c. In the list of all currently installed programs, find out any programs related to the Trojan horse and click on “Uninstall” button.
d. Then, click “Yes” in the pop-up window which asks if you want to uninstall the program.

Step 3: Show all hidden files and folders.
a. Go to Start button and select “Control Panel” option.
b. In the “Control Panel” window, click on the “Appearance and Personalization” link.
c. Select “Folder Options” and click the “View” tab.
d. Under “Advanced settings”, tick “Show hidden files, folders and drives”, non-tick “Hide protected operating system files (Recommended)” and then click the “OK” button.

Folder Options-Win 7

Step 4: Remove all files relative to Trojan:Win64/Sirefef.D.
a. Navigate to the local disk C.

open local hard disk C

b. Find out and delete all malicious files created by the Trojan horse.

%AllUsersProfile%\Application Data\.dll
%UserProfile%\Desktop\[Trojan horse name].lnk
%UserProfile%\Start Menu\[Trojan horse name]\Help.lnk
%UserProfile%\Application Data\Microsoft\Internet Explorer\Quick Launch\[Trojan horse name].lnk

Step 5: Delete all registry entries associated with Trojan:Win64/Sirefef.D.
a. Open Registry Editor by pressing the Windows key + R key, typing “regedit” and clicking OK.


b. Search for all the registry entries associated with the Trojan horse and remove them all.


HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run “random.exe”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\[Trojan horse name]
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\[Trojan horse name]\DisplayIcon %AppData%\[RANDOM CHARACTERS]\[RANDOM CHARACTERS].exe,0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\[Trojan horse name]\DisplayName [Trojan horse name]

Method 2: Automatically Remove the Trojan Horse by Using SpyHunter.

If you are not expert at computer, automatically removing Trojan:Win64/Sirefef.D will be a better option. SpyHunter is a reputable anti-malware program offering detection and protection against malware including Trojans, worms, viruses, rootkits, adware, spyware, ransomware, etc. You can follow the steps below to download and install this powerful removal tool on your computer, and then run it to detect and remove all found threats on your PC.

Step 1: Click SpyHunter Download Link and save the file in your hard drive. When a small window pops up, please click on the “Save File” button.

spyhunter-save file

Step 2: Once the file is downloaded, double click on it. And click on the “Run” button when a window appears and asks if you want to run this file.

spyhunter-run setup file

Step 3: After that, SpyHunter installer will be downloaded. You can see the downloading process as shown below.

spyhunter-download installer

Step 4: Once downloading finishes, select the language, accept the SpyHunter license agreement and click “Next”.


Step 5: Keep following the wizard during the setup process. When you are presented with the prompt saying that SpyHunter has been successfully installed, click the “Finish” button.

spyhunter-installation finish

Step 6: Then, launch SpyHunter by double-clicking on its icon, and then click on “Scan Computer Now” to scan your system for Trojan:Win64/Sirefef.D and other potential threats.


Step 7: The scanning process may take 20 minutes or more (depending on the number of files in your system). So, you need to wait for some time until the system scan is completed.

spyhunter-scan files process

Step 8: Once SpyHunter finishes scanning your computer, make sure that all malicious items are selected, and click on the “Fix Threats” button. Then, SpyHunter will begin remove all threats from your PC. Restart your computer, and Trojan:Win64/Sirefef.D should have been completely removed out of your PC.

spyhunter-fix threats

Tips to Protect Your PC from Malware Infection

Install a reliable anti-malware program and update it regularly. Your first line of defense would be a powerful anti-malware program that provides real-time protection.

Always update the software installed on your PC. Software vendors constantly releases updates for programs whenever a flaw is discovered. Getting the updates makes the computer more secured and help prevents spyware, worms, viruses, and other malware similar to Trojan:Win64/Sirefef.D.

Keep your operating system up-to-date. Malware tend to exploit system vulnerabilities to attack your computer. Keeping your operating system updated helps protect against the malware attacks. Besides, you should configure your system to perform automatic updates to ensure your system is operating with the latest patches.

Use caution when surfing on the Internet.
1) Be suspicious of any email attachments from unknown people or with offers that seem too good to be true.
2) Avoid clicking on suspicious links in emails or instant messages, or you may be linked to some malicious websites.
3) Don’t click on misleading pop-up windows in unsafe website, or you may download unknown malware onto your PC.
4) Don’t download and install software from unreliable sources. Some malware come bundled in software packages and once you install such software on your PC, you install malware as well.


Trojan:Win64/Sirefef.D is a dangerous Trojan horse which infects users’ computers for the purpose of stealing confidential information as well as valuable data. Once installed in your computer, this Trojan horse will change many types of settings in the system, randomly delete or overwrite system files, disable important programs or services, drop other malware to the infected computer, and also try to collect confidential information & data stored on the computer. To fix or avoid the problems caused by this Trojan horse, you need to remove this Trojan horse as soon as you find its existence on your computer. We have introduced two methods to remove Trojan:Win64/Sirefef.D above, you can choose one of them to deal with this threat.

Warm Tips: The manual removal involves the removal of files and registry entries, which would result in unexpected system damage if you wrongly delete any important files or registry entries. Even computer whizzes would be cautious when they resort to this removal.

That’s why we highly recommend you to download and use a powerful malware removal tool help you out of trouble. SpyHunter is a user-friendly removal tool which can do a complete scan of your computer and completely remove all the detected threats without causing any side-effect. Now you can click the button below to download SpyHunter on your PC.


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